<template>
  <div class="todo-header">
    <input type="text" v-model="title" @keyup.enter="addItem" placeholder="请输入你的任务名称，按回车键确认" />
  </div>
</template>

<script>
export default {
  data () {
    return {
      title: ''
    }
  },
  methods: {
    addItem () {
      const title = this.title.trim()
      if (!title) {
        alert('输入不能为空')
        return
      }
      const todo = {
        title,
        complete: false
      }
      this.$emit('addTodo', todo) // 触发自定义事件
      this.title = ''
    }
  }
}
</script>

<style>
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>
